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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb82f21094fd9842b11426a166545268d6eb7648d9fc6155555d30e2b0f6db5c' 
  AND token = 'GB3dYuZ6ZUthj7hdV/Y9T6W70t7gjB+UUZoeac5VSkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}