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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6833a0b098fbe32baffe9626b49516b8cc80b30ef6c4cf7f0fc7cd741ac3d536' 
  AND token = '22ZnFR5cFqJQqppXZPKjF5rNPBWh41OJjxyHSOuUqeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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