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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0a5fb28df113da27bf229a245d6b556e1e8aae090b04f4dc48e6de794e4081' 
  AND token = 'cBboZz8WcYbqnIjGRnuNa0qAetyRnS4T9Xsemz5SqGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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