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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a823844e34f253e15464cd8e8f6cbcd781c43c466a116a0c522ef68f36ca63' 
  AND token = '7T7MQlDdfANMUoOXE30aYADvPqjwyRHmzsDYSP6tGmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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