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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855d6251c02e4c69e818229f0abdbcfcd3044efc2b881d822afc16fe778ad9a9' 
  AND token = 'abzC0NCNlkVAovupYhl7McFRzG9g7VgL2QkwHAPhVUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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