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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f006434356584f17addd564f6ef47f0ce5d9b5392ff26b1fc48c501cebb82d2d' 
  AND token = 'wgCoTUg+U9vahCAZVdJbDaEVPeM3f1XMyMeq90Rk6cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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