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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b325642367b116981de631064f315aa8df2bf380ea4c22b42b6b57464a75fe' 
  AND token = 'NvRRAi/5Kh0YnSvLwqcDWQNXeHLOi6njSEW34odb8/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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