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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efc5ff05b2e8118c1caff1c31538f26cada59ee1a0e9a55c2d1b7255175de7e' 
  AND token = '45SWOKhTEEx7ljUBho1FVZ//gaYExky5h4GvW5p5wTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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