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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce28004eb4a080e4ec2fa4e2815cc7d1669aff4b473ea6f05085007c9e866f9e' 
  AND token = 'wGzoK22e8LhSAkpGE877zD0VIcis//B0j/d3I1+7gZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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