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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d7a279bcce19d251e3b3a6a195bff269fb7f69fa0af5d7b6ef5d18be4a72ef' 
  AND token = 'ao0fVjW4Utk7qc/618LgwdTp+c/ANHqTRC/SeXtCED8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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