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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d6cc5914b20a39cc3b1eb068309bde6b7924e6ebe7ab50f183c114d7b608bd' 
  AND token = 'nw5boEKT0lFLtRp8FB5KVZ5v63jdJQVPiga6Z3DCZZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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