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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5585b04378647450cf67a3f1601b324d1c4baa6bdd43e1739464cd3a49bec178' 
  AND token = 'd22aMV11XBuuU3cGW6UVLLigKgNxzJ5m8a6iUI+Aa5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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