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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7c9109bafe2e28c61c729a1b3b6ea68f90b9491fd68e06e527c608a1c47ca0' 
  AND token = 'jsLxMsOSftwv6sl2cE/Mg0C0SHh29EeDbY+7P8n4kV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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