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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37eb87cc058d54cca715654af13989895eec836b9ebde0524e46d95a4ff498ce' 
  AND token = 'ZN98nGUR4SmyLO/LxyOduur8R6dfkuJehhQ/g34GD/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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