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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc236807bd07da31a35d70a80b4a70d1307ea59bd14e94c46a61bd07950a20c2' 
  AND token = '++Q0w8iRlDy6uR5KutkwaHC1eW89OevyRLK9W1sITOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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