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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675bcc5fdcdd25d7cf56b2f6307d7e7b0fa2fdd92b057baab5099eafd3af58bc' 
  AND token = 'MtBbRADpmwgbtbYZx2+Q4MsLrq1n6/KFx9GIZYjGzRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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