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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1359b438a31fcfd0e44451feb4f429ada38c7af2157273192b6445a0d9ed9b3e' 
  AND token = 'qDex+FAJgjUILbLgvRg49+jPCXtrmGt/jbyoxga/s3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00158

JSON explain

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