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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5835292fec716706fb869a586c3df050ab22c208cfcdff62982293bff6f420ef' 
  AND token = 'oTSVpRVmkRWpUK1+g3qW8R2Pw/uwHNvu9wsfhDq0p/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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