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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cdd5fe55a545fc6a8dd5f33b72329d249e8d7af28d19f714b2dd704d08aacd' 
  AND token = '5lxbvecwHz3NkUC0tIZEDgjRwNrL6/RPkfmwj+mGRe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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