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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400d1760d31a9f8ec5e9781148b8f5e2e46a1d24d955c16888b5c620bf7ccc27' 
  AND token = 'xEjSQf5vy/GLihMU3ibjRNhDU3uSadR6X8sKM0xBAV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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