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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848f6ceda9a8a3a9f7d87945f4545b7884e1bc0b353e409be9acb9f935be2b16' 
  AND token = 'W2C4n5zaRbRjjYexJmuLdF9DsI3sDGtVuuJYwzj6tVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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