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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eec473e2a1e6cb8c661b1c46523eb47425bf9cb2d15fe062d99e8f0ad128cc6' 
  AND token = 'ecGn9Tn2cj7F6ihAHEOn3zp4RCPpmBNoL5OT83Wg2ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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