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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b88e395104835b494ae9ce38b61c7545b83979801bac756065837db59e8c14' 
  AND token = 'um7LCF49Q083L1jvTj3szq7jTNGPqPyULmRBkOojQVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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