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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da6044f0ed539c03291a355f1f50c1ce2c8550dff5ac23f0def5e4b2b5a845e' 
  AND token = 'H/wTmgwN10CqCUa0TYG0ivLzT0dWtRGPiR0UUJFj1Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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