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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1ef1fdbcfe5950df56fe6152cbb3f9cc43ecf6f2db6b0f258943e3206dab05' 
  AND token = '1PMIYJrcokJPel4VmloXJl961X1i4M/Hndu1fOdvpqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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