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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36122785cdc9401029309cc0fd25df5ea13d04d92766e5676d64682b8149b538' 
  AND token = 'hlBFdEJEwd8HB4AlZSe2quMd+FYo5QfU8R1p9tNYRsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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