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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3dd3553b76ecede11d871ea7ce0a8be4c18aef74604d34098ad3f50c7c588e' 
  AND token = '/zOoa2LOMEuw3eWX94mai4MpbMwTpiRk0eyszUVNpoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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