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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63700259fa334d1125705f14b0fcff552b6aa8b2f1417eaaaf881555327c55b' 
  AND token = 'BOPQbECzZuCydaIl2HGDC2X7p9o+q659z2nHZS4kgEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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