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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea41f75bc6d1010ed0650554f9c55241cf9fbbf1f1072e806aa74268795e65bc' 
  AND token = 'RQiTRGrFuqGmJ8TfII4KaD1J9Ji8/CmGgAM1eYTvtmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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