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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55256c345eaa5a88eec191f41e0ab4665553e77be4094bc3ab69ea734fa91d46' 
  AND token = 'f3y3PRcO3wsJP6RDkJU9V4tcXHkzy8VpB4EtMyUZg7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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