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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea409ed3d3a3c193993d57a72dd7ca37e3e3f839461bc856bb5504c06cc34fc' 
  AND token = 'hT8Hk9ArD6Hx6WXuAIINp685xU5U0s4E/Pd/giNEndU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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