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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a6703c42be3366b6e80397ea8208b5bdb91fde5d6eababb50a015ec076bb9e' 
  AND token = 'nF9HtFjwPmhBauFdwV+rGMFYRoa8yY9jY11Ef84yPKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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