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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe01ee79a03fb28a172e49a746fec43285630aacd5e988e4d7e4db61ea15491' 
  AND token = 'bhsrY8hI1+K9SL8UJn6c4j9zqfEK1I+p0c8M6Pjcfqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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