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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512b95684746527429a216a72c1da4f06944cdf218a5e872f0bfd804177b030d' 
  AND token = '8425pETiB3JOL97/YBpNfYdeDpR0CE2g9XxvEqDGqRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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