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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134f799f5ceaff7ab6393ac05b5a6923edb2abbb9e3a5b4d627b5f760c4f512f' 
  AND token = 'm439SQE03ru3u/2/JGjqomuplYXBM6YrfXS3j1DWj2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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