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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655997b1f11248ea7aae5a0e08236bdf8a649637d709d166b99dd6d8515c29eb' 
  AND token = 'Dhl+oWbdKnvKTGFYVSXe12nZ8kwJGFNOaMNN4Ep1B2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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