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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725cf0c5208493661cfd0906d610856eeb3bfa3b8596221b4a18d1d0549b4b13' 
  AND token = 'l8Y0vF22fH76Cp9NWUBhU9QSa9api86WFU+Y0OXeEd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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