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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0bd30b3ab41ae4259ecb4fad4f7e03e9c773b9b5cd446aed28ccc143ea85db' 
  AND token = '0Nl6PCNIk6KHacmEvUS6NjSp3oQV21mGt1KCBzsq7d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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