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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ac16146f663ea02e745f486e99d00e904f713e5fdca718af909f51c94004e9' 
  AND token = '5JPKRRVZR8g6d/VtTqZFsTs+JX8rUpT9VNzCmDJfABQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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