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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617084b5dbde8c4139dbd5dd8e00a862aa146d75e36b8984bb727cd04c0b0085' 
  AND token = 'qewr3FzbULFjMnMTfyP8R7gj9H+1VbP35ng9yz/MRvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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