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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690a65b2f680f838e61d9dd0856f61f05e5dde17b1a290744dcb8a200aaa0818' 
  AND token = 'nnHHyI0TNAqv0TxZSbOMPVDNgvg0BJ0Y+00z5M+DRlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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