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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2f0b154bd68455227e6a2c5b40fd6a5d8b84cf6ed61fd0cbfd28ed02d4e4f9' 
  AND token = 'v7eA5Kz5pFssnhw4kl+nuhWd3FKmcNFGDVwIXN2ciiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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