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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d9f8695448e1507b3b7b40fb80758ba46901ee78a1aa51b31f7eb34309becd' 
  AND token = 'nV15tAnHKDD7aBGVFXd0EdtDZ591eeePuUan6GYvoaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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