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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3001fc6decb9ef327a4f65d77f5cd213edd10647cb3fee320e903bfa531086f1' 
  AND token = 'R25La5E12cP+x9iG2JHle8Ak/JUo+WEhpy5P3yEoveQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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