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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027399468f67a78cff43200580f39336438bbffd20b9ddf72ea83b042cf829af' 
  AND token = 'uusO9akDAzvH8RApDP/Azhu5jAMlH4dkDOzQ6hJ+rt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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