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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe6eabd4b6028bbcc6f43ade6f0f9e2e0dfdcbec8dfc526cb6da3d527c75004' 
  AND token = 'rw4BrgfN+A9Oj4NOI0soyffpNLr2fF7S4fLTEcbfOx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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