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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f281f243a60ec5d013a92e7e8ad6afd738b57e199ed705fdedba3bbbcc02f6' 
  AND token = 'Ql24azKTJvwAvpo9W4IBfiNAXEvKmD17+pe9fg6NaBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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