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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bba05e8626394b4435ffdce482bb2c22a91715076e8e87140d8d1b3433a3ca2' 
  AND token = 'a1sfMJYVxW75eoSZrgcAnMHVJlHH27bgGz0hn+Othr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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