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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef5f916dc96875c2c7c8121804e5d90cb23888145bdd55a71ba6622093aef84' 
  AND token = '3hAOJXzlajNUm3xlo510/6xX/Gzkf0vAfOr1l0edf1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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