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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de13d783ceafbba9447712752faf0e4f98c49b9d6a334d060dac577953b0e72e' 
  AND token = '08pmDYidzc/yoGTiK58pIoQLEMP/tYzhZi/waYpYLEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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