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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4660b035c4f22f50a0055fb447443673be460fa97f25d161de97f0db5902374' 
  AND token = 'OI0ADdL+/kHAyh5Rek0EUjRUcJ0EGY/SXu/N0EfPEbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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