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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c129e1623c95c6e33a2276b2454609dfb2f7c8208c234428a303b51de1daa7' 
  AND token = '8m13hF69asWXl3mlWueDCV/OU/3N/TAAiSN56+lb+9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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