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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4ae147cfdef021ec0cd85ecbd0bdb5f16d74d6e8d07d8c2ef73bda37bd622f' 
  AND token = 'UfMFTppMdtqm/idCwXkptWAHBRLpK8NFaZxLB1B7vcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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