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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbfe31c18e05484b190fffee20b71a8e35bcac74362ccf3b85d7c37c16e5bd1' 
  AND token = '26bx6zJh8oLiHFuRuORT0a6xfbY6vi64hRABbilJJIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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