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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4867a1fefc9f546e121cd769d1961bb8ac7d47c0f631e4c639f9d3a1dc09d81' 
  AND token = '3wBq99n6v9jJJ3CfxoeAgoIJa2Fg55jJUJUXFRzjIAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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