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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2375d328900c075d7ea7c23af2a965233c37408e82f128ca855a202e96a2fe18' 
  AND token = 'doVN3DHBpATBcF80H/wq8Cy9HbC3X/o6TxfN/m38Rm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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