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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4113c3a305910be1669432f4d72aed237869ff040ea396473370cbcb90cabc48' 
  AND token = 'VbDoYl7jPwIqq6CWybAcsb+Mi/pOYsZRnFMi+wn3Q/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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