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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd108bba7b340c43eca62386b2f6ad7a615fd223ae0af691eb0655d46bdf97d99' 
  AND token = 'Et9LIzHlmurUH1qJy3IJs65ZKkl5mSKCn41u2YpAtXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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