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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9bd8e0fc99df06c2a828dbb21c4cd4e4d94b6b1ae2f0562b7514fcef6024dab' 
  AND token = 'KaUGobkKRkwU53T4IKfE7iNPk8QTMo71hKT1LHhKN0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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