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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4451d72c9c55d527d0457044499465fe1cfce974c8f228333ba5f0026fe112' 
  AND token = 'kzItU1IyLFLgj3UUFIZyJIir9OyyKn6lYD2pOrwaqCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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