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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313a6951cc51e1890254f25f4a949aee2d9e98f78905795865d87d5fc50b6996' 
  AND token = 'maRSwS0ZlFL+11gCiQU7dIZa1mxxUnPZBPmERgZZ+Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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