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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b9bf902a617e8a9014dc425ca58c1027a8e478a823aae2693e0cfafe3b9f86' 
  AND token = 'hHC+wL9a7rDqexpF5gyHxlrX44VvpeIcBl86oLgZ6lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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