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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde30733514baab2cbf8140d74f1fdcdb384f05428b2f4eafef58a7dd5334151' 
  AND token = 'fXJVNCGkRExgPKufNJR6l709iLbsfFg2xgo2TgseAPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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