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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c4a29c1bc2c54a7f0976fb938433c1c4eebbccb517c7585fa54eee26dd3961' 
  AND token = 'R6uskXom9hhieFnI9O5wkyWh0CYMqALjcumlK4J0bSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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