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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd061a387ea82db19c603ae807243f3e8355ede1524f3a8ed902a27b38d75d5cb' 
  AND token = '0pCDa7TMrj56WOrlhGfumB/FLaioBB30R3XRLCra19w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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