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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abf98fe6b24d2a564bb629984622d7e201ea639c422de499509377340f3dd1c' 
  AND token = 'tcxzuKcsXRr/87EzbhdacqpDo9CxSO3QDxelhs43X2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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