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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959f1462706fb340659c86ad4275e564399d408199f9a2ab08d42a1fca8f5eff' 
  AND token = '0xCfaLZ/8lZPfp1zlblFfyxhrbuySXudyH6zU18G4/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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